Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [ 34/34] usb: Prevent dead ports when xhci is not enabled | Date | Thu, 7 Feb 2013 16:57:30 -0800 |
| |
3.7-stable review patch. If anyone has any objections, please let me know.
------------------
From: David Moore <david.moore@gmail.com>
commit 58b2939b4d5a030eaec469d29812ab8477ee7e76 upstream.
When the xHCI driver is not available, actively switch the ports to EHCI mode since some BIOSes leave them in xHCI mode where they would otherwise appear dead. This was discovered on a Dell Optiplex 7010, but it's possible other systems could be affected.
This should be backported to kernels as old as 3.0, that contain the commit 69e848c2090aebba5698a1620604c7dccb448684 "Intel xhci: Support EHCI/xHCI port switching."
Signed-off-by: David Moore <david.moore@gmail.com> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/usb/host/pci-quirks.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/usb/host/pci-quirks.c +++ b/drivers/usb/host/pci-quirks.c @@ -780,6 +780,7 @@ void usb_enable_xhci_ports(struct pci_de "defaulting to EHCI.\n"); dev_warn(&xhci_pdev->dev, "USB 3.0 devices will work at USB 2.0 speeds.\n"); + usb_disable_xhci_ports(xhci_pdev); return; }
| |